Adjustable wind-vane sight



33. GEQlJiETRlOAL INSTRUMENYS.

Patented July 10, 19280 r sr CHARLES L, PAULUS, OF DAYTON, OHIO.

ADJUSTABLE WIND-VANE SIGHT.

Application filed June 27,

This invention relates to wind vane sights of the type used for automatically controlling the position of the sight bead in a machine gun for aircraft use.

The principal object of my invention is to provide a means for easily and quickly adjusting the position of the bead in relation to the supporting standard, so that the bead may be adjusted to compensating for the speed of the airplane on which the gun is mounted.

Further objects will be more fully set forth in the attached specification and claim.

In the drawings:

Fig. 1 is a side elevation of a wind vane sight showing the application of my invention. Fig. 2 is a top plan view of the same, and Fig. 3 is a front elevation of the bead supporting member. A suitable supporting standard, 1, has pivoted thereto in the points 2 and 3, a plurality of parallel arms 4 and 5. Arm 5 has a rearward extension, 6, upon which are mounted the customary wind controlling vanes designated generally by the numeral 7, and consisting of horizontally and vertically connected vanes, which control the movement of the arm 5 about its pivoted support from the standard, and also controls the rotational movements of the assemblage about the member-upon which it is mounted. A bead 8, is formed from the upper end of the vertical bead supporting member and this member is provided with a plurality of projections 10, 11, 12 and 13 of cylindrical form, and the outer ends of these projections are provided with members 10, 11, 12 and 13 respectively.

The arms 4C and 5 are constructed of two separate parallel spacing arms, the arm 4 being composed of arms 4 and 4.", each of which is provided with a slot, 1 1, having a series of notches, 15, of semi-circular form and having a diameter substantially equal to the diameter of the projections 10, 11, 12 and 13 of the bead supporting member. Between the upper wall, 16, of the slot and the notches, 15, is a considerable space which is greater than the diameter of the cylindrical projections on the bead supportin member. It will therefore be apparent that the projections on the bead supporting member rest in the notches in the different grooves in the pivoted arms, and that the outside vertically extending contmuations of the cylindrical projections maintain the bead supporting member, and the arms in their 1923. Serial No. 648,119.

proper relative positions, serving to properly space the arms,

A spring, 17, having kinks 18, one kink being positioned opposite to each notch in the slot, is fixed at either end as at 19 and 20, to the different parallel arms of the sight, there being four of these springs, one for each of the projections on the bead supporting member. These springs are suitably positioned just inside of and close to each arm so as to press downward from the projections of the bead supporting member and maintain the projections of the bead supporting member in their notches, but permitting at any time an adjustment of these projections without the operator doing more than forcing the bead supporting member to the right or to the left from the position as shown in Fig. 1. When so adjusted, the springs will give very easily and allow the projections 10, 11, 12 and 13 to rise upwardly from the curved surfaces of the notches and enter the succeeding notch. Due to the fact that the kinks in the springs will extend for a short distance practically around the upper surfaces of the projections 10, 11, 12- and 13, they will maintain said projections in the proper notches.

It will therefore be seen that I have provided a sight which is adapted to be very easily adjusted by a quick movement of the operator, so that the bead is always maintained in a position to lead the sight post properly in a direct line of flight of the airplane, in order to compensate for the speed. of the airplane upon which the gun is mounted, it being obvious that a greater range of travel of the bead 8, is provided when the bead supporting member is at its extreme position to the right from the one shown in Fig. 1, and that its travel may be proportionally decreased by moving this member closer to the axes upon which the parallel arms are mounted.

I claim:

1. Adjustable wind vane sight for lire arms comprising a support, a plurality of notched parallel arms pivotally mounted on such support, a wind vane controlling the movement of said arms, a bead supporting device, means on said device to fit the notches in said arms and a kinked spring on said arms respectively to maintain said means in the selected notches.

2. Adjustable wind vane sight for fire arms comprising a support,'a plurality of that the spring and the notches together determine the position of the said device.

3. A wind vane sight for fire arms comprising a support, parallel spaced arms pivotally mounted on said support, a wind vane controlling the movement of said arms, a bead supporting device, each of said arms being provided with a slot, projections on said device and adapted to be seated in said slots, and a kinked spring attached to each arm, the kinks in said springs being positioned to engage respective projections and determining the position of said projections in said slots.

4. A wind vane sight for fire arms comprising a support, parallel arms pivotally mounted on said support, wind vane means controlling the movement of said arms, a

bead supporting device parallel to said support and adjustably connected to said arms so that the points of interconnection may be manually adjusted along said arms and maintain said device parallel to said support and resiliently yielding means for maintaining said connections in adjustment.

5. A Wind vane sight for fire arms comprising a support, notched parallel arms pivotally mounted on said support, Wind vane means controlling the movement of said arms, a bead supporting device adjustably connected to said arms and selectively engaged with said notches, and means for maintaining said connection.

In testimony whereof, I aflix my signature.

CHARLES L. PAULUS. 

